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CONDUCTION
CONVECTION
CORE
CRUST
CYCLE
ELECTROMAGNETIC
MANTLE
MATERIAL
MINERAL
NATURAL
NONRENEWABLE
ORE
PETROLEUM
RADIATION
RECYCLING
RESOURCE
TEMPERATURE
THERMAL
| H | O | L | A | R | U | T | A | N | N | M | E | E | E | E |
| I | P | W | S | Z | T | L | Y | P | V | F | R | A | L | N |
| I | J | B | F | D | C | O | N | N | H | W | O | E | B | Z |
| O | D | N | O | I | T | C | E | V | N | O | C | S | A | Q |
| Y | L | H | K | L | A | M | R | E | H | T | O | Z | W | D |
| C | N | O | I | T | A | I | D | A | R | E | N | M | E | C |
| E | A | Y | N | I | C | E | R | O | E | M | D | U | N | E |
| L | A | I | R | E | T | A | M | M | C | P | U | E | E | K |
| C | Y | C | L | E | B | A | I | D | Y | E | C | L | R | W |
| M | Z | H | Q | V | G | Y | N | Y | C | R | T | O | N | L |
| U | W | B | U | N | E | R | E | T | L | A | I | R | O | T |
| V | V | O | E | F | J | F | R | S | I | T | O | T | N | M |
| E | L | T | N | A | M | O | A | U | N | U | N | E | W | P |
| O | I | N | J | V | I | P | L | R | G | R | I | P | S | Q |
| C | Y | R | E | S | O | U | R | C | E | E | O | A | U | S |
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